Question about Refrigerators
My refridgerator stops cooling and the freezer continues to work. There is ice build up on the back of the freezer. It was doing this about every other month, now seems like continuously. I was told it was in the defrost cycle. I have replaced the Heater Defrost ***. and it still is happening. The only ohter things I see in the defrost area in the parts diagram is a thermostat defrost, sensor temperature evap, and possible the board main asm control. Any suggestions? I am a maintenance maechanic by trade and surely can replace a part.
It's a GE refridgerature, model # STS221CMBRWW
SOURCE: Freezer won't defrost
Savey, this is for the HSS model. The unit will not go into defrost by pressing the light switch 5 times. It is not programmed to do this. The defrost is controlled by length of time the doors were open since the last defrost. Length of time the compressor has run since the last defrost and the amount of time the defrost heaters were on during the last defrost cycle. Unplug the refer, on the main board unplug the blue connector. Measure the resistance between the blue wire on the connector and the nuetral orange wire on main board J7, pin 9. It should read approx 22 ohms. If it doesn't, check the heaters and the defrost safety thermostat. The defrost safety themostat is a back up to the evaportator thermistor. If that checks ok, verify that the evaporator thermistor and freezer thermistor is in proper range. At 15 degrees, they should ohm at approx 27K ohms. The higher the temp, the lower the resistance. If that checks ok, then you have a board problem. You can send 120V to the heaters by jumping Line to defrost on the 3 pronged blue harness. See if the heaters come on. Catriver.
Posted on Jun 10, 2007
CHECK THE DEFROST HEATER FOR CONTINUITY. IF IT IS O.K. CHECK THE ELECTRONIC CONTROL FOR A FAULTY SOLDER CONNECTION ON THE DEFROST RELAY. THE ELECTRONIC BOARD SHOULD BE LOCATED ON THE BACK WALL OF THE REFIGERATOR BEHIND AN ACCESS PANEL.
Posted on Apr 10, 2008
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To answer your question I know of no reason the electronic type of board would cause the heater to go out unless the defrost thermostat (or sensor) and board stuck in the defrost possession and did not stop the heater. Any time you replace the board and have had a defrost problem a check of the heater will either confirm or eliminate it but the defrost sensor should be replaced if the board is being blamed for non defrost. I cant rule out 100% that a bad board will not cause a heater problem but the high 99% range is most likely. If you have a volt ohm meter and can find the heater circuit on your board and the freezer has been running down to correct temp you can check the defrost circuit by ohming it out. Lower resistance of 10 to 60 ohms is common. Anything higher will require ohming the heater out directly and the defrost thermostat will be open if the temperature is above the stats range.
Common to all self defrosting refrigerators / freezers is the need to move air around to pickup heat inside the compartment. Common to all frost free refrigeration to maintain this feature are 3 items:
1 and initiator (defrost timer or circuit board),
2 A heat source for defrost (Usually an electric heat element but can be other types of heat sources)
3 A safety limit to stop the heat source, leaving it warm enough to defrost and keep the heat contained where it will not affect the compartment advisedly. In a standard type defrost (non - electronic) it is called a thermostat. In an electronic board defrost it is called a sensor.
The defrost timer / or board will never be in the Freezer. Other than that it could be in the refrigerator section behind a plastic cover or metal cover on the back outside. It could also be under Neath the front corners or center of the front kick plate.
A timer you can turn the cam clock wise till it clicks. A board will depend on the manufacturer as to how to send into defrost for a test. A sensor on the defrost type board may be required to by-pass into defrost or test mode.
The freezer section has the only cooling coil. It sounds like it is blocked with frost and thus won’t let the air circulate from freezer to refrigerator.
There is a defrost timer, (or board), a defrost heater, and a defrost safety thermostat. Any One of these or a combination of 2 can be your problem. If you have a energy efficient model that has electronic controls then you will have a board. The procedures for checking the circuit on a board vary by manufacturer of the board used and manufacturer of the appliance.
The defrost heater always has resistance and is attached to the freezer coil.
The defrost thermostat is also attached to the heater electrically, unless it is an electronic sensor type. Sensor types have a range of resistance that needs to be known to check and varies slightly with the temperature of the sensor.
If I haven't lost you here you maybe equipped with the life experiences that will allow you to do most of these checks. If its over your understanding I recommend you contact a reliable technician..
Posted on Apr 17, 2009
the defrost thermistor is your problem: it is going low (turning off) the defrost circuit far too quickly; it is a solid state version of a gas filled cold control sensor.
It "tells" the adaptive defrost controller circuit board the condition: (frost level) of the evaporator and, intitiates the defrost mullion heater timer. if it turns off to soon defrost
mullion heaters turn off and, icing occurs. I do not know; right off hand: which boards you are alluding to; however I believe you are referring to the power supply board for the
Posted on Jul 20, 2010
Testimonial: "I will let you know after replacing the part if it fixed the problem. I tested the thermister at 32F and it shows no continuity(infinity). Many thanks"
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